Add ChatClient.dispose() documentation

[AndyTWF]

Summary

Add documentation for the new ChatClient.dispose() method that releases all resources associated with the chat client.

Related PRs

• Add dispose() method to ChatClient for resource cleanup ably-chat-swift#477
• Add dispose() method for proper resource cleanup ably-chat-kotlin#188

Changes

• Added new "Dispose of the client" section to the SDK setup page
• Includes code examples for JavaScript, React, Swift, Kotlin, and Jetpack Compose
• Documents what dispose() does and its idempotent behavior
• Notes that the underlying Realtime connection is not closed by dispose()

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chat-dispose

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